IAE SuperFan

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The IAE V2500SF SuperFan was a concept for a high-bypass geared turbofan based on the IAE V2500 core. It was offered in January 1987 as the primary engine option for the Airbus A340-200 and A340-300, aiming for about 28,000–32,000 lbf of thrust with roughly 80% of the V2500’s fuel burn. The design featured a geared, single-rotation fan with variable blade pitch, a very large bypass ratio (around 18:1 to 20:1), and a fan diameter of about 107 to 118 inches. The gearbox was planned to be a Tyne-based 3:1 planetary system, using proven components from existing technology.

Although several customers showed interest, the project was officially halted by the IAE board in April 1987, and Airbus had to redesign the A340 to use a conventional engine instead. The program was treated more as an engineering study than a firm development, and there were concerns about the readiness of the low-pressure system, the gearbox, and other critical parts. Airbus extended the A340’s wingspan and fuel capacity to match the planned SuperFan performance, while Boeing and others explored possible mounts for the engine on different aircraft.

If the SuperFan had progressed, it would have been a major advance in geared-turbofan technology and could have affected other airliners as well. However, with the cancellation, Airbus continued with a conventional engine choice (the CFM56-5C) for the A340, and the SuperFan never reached production.